NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes

	NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes
	Liu, Xin; Pan, Xiulian; Shen, Wanling; Ren, Pengju; Han, Xiuwen; Bao, Xinhe
刊名	journal of physical chemistry c
	2012-04-12
卷号	116 期号:14 页码:7803-7809
通讯作者	包信和
产权排序	1,1
英文摘要	adsorption of c-13-enriched methanol in multiwalled carbon nanotubes (mwnts) was systematically studied under well-controlled environment by c-13 mas nmr. the results of variable-pressure experiments indicate that the endohedral adsorption of methanol in carbon nanotubes (cnts) is preferential over the exohedral adsorption. the exohedral adsorption does not occur until the endohedral adsorption saturates. the c-13 chemical shift of endohedral methanol exhibits a large upfield shift due to the strong spatial diamagnetic shielding effect induced by the delocalized electrons of nanotubes under the influence of external magnetic field. the exohedral methanol is also shielded, but to a lesser extent. dft calculations support these experimental results. the c-13 spin lattice relaxation times, t-1, of endohedral and exohedral methanol were also measured, and they have different vapor pressure dependence at room temperature. furthermore, variable-temperature experiments suggest that methanol molecules inside cnts may form a layered structure at low temperature with one layer close to the wall and the second layer near the center of the nanotubes.
学科主题	物理化学
类目[WOS]	chemistry, physical ; nanoscience & nanotechnology ; materials science, multidisciplinary
研究领域[WOS]	chemistry ; science & technology - other topics ; materials science
关键词[WOS]	physical adsorption ; water-adsorption ; xe adsorption ; tight-binding ; single ; spectroscopy ; kinetics ; storage ; models ; xenon
收录类别	SCI
语种	英语
WOS记录号	WOS:000302591300025
公开日期	2013-10-11
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/118352]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xin,Pan, Xiulian,Shen, Wanling,et al. NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes[J]. journal of physical chemistry c,2012,116(14):7803-7809.
APA	Liu, Xin,Pan, Xiulian,Shen, Wanling,Ren, Pengju,Han, Xiuwen,&Bao, Xinhe.(2012).NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes.journal of physical chemistry c,116(14),7803-7809.
MLA	Liu, Xin,et al."NMR Study of Preferential Endohedral Adsorption of Methanol in Multiwalled Carbon Nanotubes".journal of physical chemistry c 116.14(2012):7803-7809.